Siemens alarm F31875: Encoder 1 DRIVE-CLiQ (CU): Supply voltage failed
SINAMICS S120 encoder fault (Sensor Module / DRIVE-CLiQ encoder) · SINAMICS S120
What it means
The Control Unit learned from the DRIVE-CLiQ component that its power supply voltage has failed (fault cause 09h). The component named in the message value lost its 24 V feed - either its local supply tap or the upstream distribution. Since DRIVE-CLiQ carries both data and power, check connectors and the 24 V dimensioning feeding that node before replacing it.
Likely causes
- 24 V feed to the DCL component open (cable, terminal, fuse)
- overloaded 24 V budget for DRIVE-CLiQ components
- intermitted contacts in the component's DCL connector
- component internal supply converter failed
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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6FX2003-… DRIVE-CLiQ cable
cable · Common cause
Need the part urgently?
Send us alarm F31875 with your machine details — typical RFQ turnaround is 24–48h.